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Old Sep 17th 2011, 04:05 PM   #1
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Question Average Accleration

Please solve this questions or list down the formulas

Find the magnitude of average acceleration of the tip of the second hand of length 10cm during 10sec
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Old Sep 18th 2011, 05:32 AM   #2
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This seems more like an experiment that you need to perform to get results... Be well aware that the practice answer might not be what theory suggests because of several factors in play during practice and that my answer (which will be theory) might very well be off the answer your teacher is looking for.

In 1 sec, the second hand moves 6 degrees from rest, to rest, reaching maximum speed in the middle of its course. Initial point is at 0, and final point is at (2pi(10)*6/360) cm.

Use v = u + at.

v is final velocity
u is initial velocity
a is acceleration you're looking for
t is the time taken.
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Old Sep 21st 2011, 03:46 PM   #3
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If yuo can assume that the second hand moves at a constant speed (i.e, not stopping and starting each second the way Jerry described), then the rotational velocity is w=2 pi radians/minute = 2 pi/60 radians/second. The centripedal acceleration of the tip of the second hand can then be found from a = w^2r.
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